Cutter-grinder.



E. T. GURHAM.

CUTTER GRINDER.

APPLICATION mio JULY 5.1911.

1,295, 155. Patented Feb. 25, 1919.

2 SHEETS-SHEET 1.

guna/wko@ EDWIN T. 60E/'IAM E. T. GORHAM.

CUTTER GRINDER.

APPLlcATroN FILED JULY 5.1917.

EDWIN T. GOH/Vl 3M M4/PVM EDWIN T. GORHAM, 0F GRAND RAPIDS, MICHIGAN, ASSIG-NOR TO WILMARTH & NORMAN COMPANY, OF GRAND RAPIDS, MICHIGAN, A CORPORATION 0F MICHIGAN.

CUTTEBFGRINDR.

Specication of Letters Patent.

PatentedFeb. 25, 1919.

Application filed July 5, 1917. Serial No. 178,700.

T0 all whom t may concern.'

Be it known that I, EDWIN T. GORHAM, a citizen of the United States, residing at Grand Rapids, county of Kent, State of Michigan, have invented certain new and usefulImprovements in Cutter-Grinders, of which the following is a specication.

This invention relates to improvements in cutter grinders.

The objects of the invention are:

First, to provide an attachment for a grinding machine by means of which the aces of the teeth of a cutter which is to be ground may be easily, quickly and accurately alined with the face of the grinding disk.

Second, to provide means whereby the depth of the out may be quickly and accurately regulated.

Third, to so construct the means for regulating the depth of the cut that it may be displaced from the path of the teeth to allow a new tooth to be brought into position to be ground.`

Further objects, and objects relating to structural details, will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the following specilication. The invention is clearly deined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing, forming a part of this specification, in which: v

Figure I is a detail perspective view of the head, and bed, of a grinding machine, showing my improved cutter grinding attachment.

Fig. II is a plan view of my improved cutter grinding attachment, the positions of thegrinding disk, face aliners and out regulators, during certain operations, belng shown in dotted lines and in full lines.

Fig. III is an enlarged detail section, aken m a line corresponding to line 3 3 of ig. I

Fig. IV is an enlarged detail section, taken on a ine corresponding to line v4---4 of Figs.

. IIl and III.

proved attachment, showing details of the supporting means for the face alining devlce.

Fig. VII is an enlarged detail section taken on a line 7-7 of Fig. II.

In the drawing similar reference characters refer to similar parts throughout the several views, and the sectional views are taken looking in the -direction of the little arrows at the ends of the section lines.

Referring to the drawing, the reference character 1 indicates the reciprocating bed of a grinding machine and 2 the head thereof. The head comprises the spindle 3 upon which is mounted the grinding disk 4. This grinding disk, as shown in Fig. II, is provided with a flat face 5. The base 6 of my grinding attachment is secured to the reciprocating bed 1 by means of the bolts 7, which are engaged in the slots `8. A stepped cutter arbor 9 is vertically journaled in the base 6 and is provided with a nut 10 for securing the cutters to be ground. The stepped arbor is designed to receive and hold cutters having different sized openings.

In operation the arbor 9 and the grinding cutting disk 4 are adjusted relative to each other in such a manner that the axis of the arbor 9 lies in the plane of the cutting face of the grinding disk 4, as shown in Fig. II. This insures the grinding of the teeth on the proper radii.

Mounted on the rear side of the base 6 is an upwardly extending arm 11, the arm being slotted at 12 to receive the supporting bolt 13, the bolt being provided with a clamping nut 14, so that the arm may be adjusted in a plane parallel to the grinding diskor. wheel.

On the upper end of the arm l1 is an alining stop 15 adapted to be adjusted into engagement with the face of a tooth of a cutter mounted upon the arbor, as shown `in Fig. II, or swung out of the way, as shown by dotted lines in Fig. II, or adjusted close to the disk so that its end may be alined with the cutting face thereof.

On the forward side of the base 6 is a slotted bracket 17 carrying a post 18. The post 18 is adjustably secured 1n the slot of this bracket so that the post may be adjusted laterally. This post carries an arm 19 adjustably secured thereon by means of the clamp 20.

A gage holder 21 is pivotally secured to the outer end of the arm 19 by means of the pivot 22. The holder is provided with a stop 23 which coacts with the end of the arm to limit the swing of the holder toward the arbor 9. A spring 24:, one end of which is secured to the arm and the other to the.y

holder, yieldingly holds the holder toward the arbor.

The gage 25 is mounted for longitudinal adjustment in the holder. An adjusting screw 26 is arranged longitudinally of the holder and threaded into the gage for adjustment thereof. The gage is bent iiiwardly toward the' arbor, as shown in Fig. II, to coact with the rear sides of the cutter teeth.

A screw 28 is disposed through the side of the holder to coact with the longitudinal groove 29 in the gage preventing its rotation. The set screw '30 secures the gage in itsl adjusted position.

In operation, the cutter-to be ground is mounted upon the arbor. The alining stop 15 is then adjusted to alinement with the grinding face of the disk and then to the face of one of the teeth of the cutter to be ground, as shown in Fig. II. The post 18, arm 19 and gage 25 are then adjusted to bring the gage into contact with the rear of the tooth engaged by the stop, as shown in Fig. III. The alining stop is then thrown out of the way and the gage adjusted to regulateA the amount or depth of cut.

With the parts thus adjusted they are.

ready for the grinding operation.

As the bed is reciprocated the teeth are brought into grinding position relative to the grinding disk and the desired cut taken therefrom. As the cutter is turned by the operator the teeth are successively brought to position.

With the parts thus arranged I greatly facilitate the work of grinding rotary cutters, not only increasing the output but improving the same as, by the aid of my attachment, very accurate grinding may be easily done.

I have not attempted to illustrate or describe certain modications contemplated by me, as I believe the disclosure made will enable those skilled in the art to which my invention relates to embody or adapt the saine as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. The combination with a grinding machine comprising a reciprocating bed and a grinding disk, of a base member carried by said bed and provided with a laterally extending slotted bracket and an arbor for the cutters to be ground, means for securing a cutter to said arbor, a feed gage supporting post adjustable in said slot of said bracket, an arm on said post, a gage holder pivotally mounted on said arm, a gage mounted in said holder for longitudinal adjustment, an adjusting screw forsaid gage, a set screw for securing said gage in adjusted position in said holder, a spring secured to said arm and said'holder for yieldingly supporting said gage in cutter engaging position, an alining stop supporting arm adjustably mounted on said' base, and an alining stop adjustable on'said arm to be alined with the face of the grinding disk or engaged with the Jface of the cutter teeth.

2. The combination with a grinding ma-v chine comprising a reciprocating bed and a grinding disk, of

extending slotted bracket and an arbor for the cutters to be ground, means for securing a cutter to said arbor, a feed gage supporting post adjustable in said slot of said a base member carried by said bed and provided with a laterally bracket, an arm on said post, a gage holder pivotally mounted on said arm, a gage mounted in said holder for longitudinal adjustment, an adjusting screw for vsaid gage, a set screw for securing said gage in adjusted position in said holder, a spring secured to said arm and said holder for yieldingly supporting said gage in cutter engaging position.

f The combination with a grinding machine comprising a reciprocating bed and a grinding disk, of a base member carried by said bed and provided with an arbor for the cutters to beground, means for securing a cutter to said arbor, a feed gage supporting post mounted on said base, an arm on said post, a gage holder pivotally mounted on said arm, a gage mounted in said holder for longitudinal adjustment, a spring secured to said arm and said holder for yieldingly supporting said gage in cutter engaging position, an alining stop supporting arm adjustably mounted on said base, and an alining stop adjustable ony said arm to be alined with the face of the grinding disk or engaged with the face of the cutter teeth.

1. The combination with a grinding machine .comprising a reciprocating bed and a grinding disk, of a base member carried by said bed and provided with an arbor for the cutters to bel ground, means for securing a cutter to said arbor, a feed gage' supporting post mounted on said base, an arm on said post, a gage holder pivotally mounted on said arm, a gage mounted in said holder for longitudinaladjustment, a spring secured to said arm and said holder for yieldingly supporting said gage in cutter engaging position.

5. The combination with a grinding machine comprising a reciprocating bed and a grinding disk, of a base member carried by said bed and carrying an arbor for the cutters to be ground. n, feed :rage support ad- .justahl mounted on said base, a gage holder ivota y mounted on said su port, a age iixounted in said holder for lolgitudinalgadjustment, a spring for urging said gage to cutter engaging position, and an alining stop, all coacting for the purpose specified. 6. An. attachment for grinding machines I comprising a base adapted to be mounted upon the bed of the grinding machine and rovded with an arbor for the cutters to e ground, an alining stop adjustably secured to the base and adapted to be s into and out of engagement with the face of the teeth of the cutter, an adjustable feed gage pivotally mounted on vthe base to coact 15 with the rear faces of the teeth of a cutter to be ground,- and means for adjusting said gage.

In Witness whereof, I have hereunto set my hand and seal in the presence of two 2o Witnesses.

EDWiN T. GORHAM. [L s.]

I Witnesses:

A. VAN VELzEL, F. SURDAM. 

